Better to spend the money on compression work and just use the stock barrel. A bit of spread at range is a good thing in an LMG where you're using it for suppression.
Good compression work means that your spread cone of fire is more consistent so that you know at what range your gun meets the accuracy of other guns being used with and against you, and where your spread drops so that you can lay fire on targets without thinking about it.
A fancypants barrel won't help if you don't have the consistency and precise air volume to back it with anyway, so start with some compression service and anything which might help the longevity of the gun through volume of fire, then go from there.
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